Re: [2.6.0-test-9] natsemi oops

[Manfred Spraul <manfred@xxxxxxxxxxxxxxxx>]

[netdev added to cc list: it looks like a module refcount bug with ipx]

David Liontooth wrote:

> The natsemi oops is triggered in 2.6.0-test9 too. 
>
> kernel BUG at include/linux/module.h:296
>  
That's BUG_ON(module_refcount(module) == 0) in __module_get. I doubt 
that the natsemi driver has anything to do with the bug, it looks like a 
bug in the ipx core.

> Everything freezes. 
>
> Am I the only one to get this? 
>
> I don't know when it started, but 2.5.69 has no problems.
>  
My guess: 2.5.69 has no bug check. It will oops with the right timing of 
rmmod and a packet arrival.

> Cheers,
> David
>
>
> ----- Original Message -----
> From: "David Liontooth" <liontooth@xxxxxxxx>
> Date: Mon, 20 Oct 2003 21:05:13 -0500
> To: linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: [2.6.0-test-7] natsemi oops
>
>  
>
> > Correction: I get the oops also when natsemi is compiled as a module. 
> > It is triggered not when the module is loaded, but when it is used 
> > the first time. Oops (some fragments below) followed by a total freeze;
> > nothing gets logged.
> >
> > Is this a known problem? 
> >
> > Is there a workaround?
> >
> > Cheers,
> > David
> >
> >
> > ----- Original Message -----
> > From: David Liontooth
> > Date: Mon, 20 Oct 2003 05:24:52 -0500
> > To: linux-kernel@xxxxxxxxxxxxxxx
> > Subject: [2.6.0-test-7] natsemi oops
> >
> >    
> >
> > > The 2.6.0-test-7 boots fine and works great -- until I plug
> > > in the ethernet cable. Within a second I get an oops and
> > > everything freezes. Booting with "acpi=off" makes no difference.
> > > If I boot with the ethernet cable plugged in, I get to the 
> > > login prompt, and it oopses within a second. If I time it right,
> > > I can log into the machine remotely for one second before it 
> > > oopses (so the natsemi driver is working). Very reproducible! 
> > > /proc/kmsg is empty. 
> > >
> > > If I compile natsemi as a module, I don't get the oops. 
> > > However, now the driver is not working -- I can't ping out.
> > > Everything works fine in 2.5.69, which I've been running
> > > since early July.
> > >
> > > Here's some of the oops, taken by hand:
> > >
> > > Process swapper (pid: 0, threadinfo=c042a000 task c03a47a0)
> > >
> > > Stack
> > >
> > > Call trace:
> > >
> > > ipxitf_auto_create
> > > ipx_rcv
> > > netif_receive_skb
> > > process_backlog
> > > net_rx_action
> > > do_softirq
> > > do_IRQ
> > > _stext
> > > common_interrupt
> > > acpi_processor_idle
> > > cpu_idle
> > > start_kernel
> > > unknown_bootoption
> > >
> > > Kernel panic: Fatal exception in interrupt
> > > In interrupt handler -- not syncing
> > >
> > > Configuration, lspci, and dmesg attached.
> > >
> > > Cheers,
> > > David
> > >
> > >
> > >
> > >      
> > << config-2.6.0-test7-3 >>
> > << dmesg-2.6.0-test7-7 >>
> > << lspci-2.6.0-test7 >>
> >
> > --
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> >    
>
>  

--
   Manfred